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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
-32/h = -1/3 // + -1/3
-32/h-(-1/3) = 0
1/3-32/h = 0
-32*h^-1 = -1/3 // : -32
h^-1 = 1/96
-1 < 0
1/(h^1) = 1/96 // * h^1
1 = 1/96*h^1 // : 1/96
96 = h^1
h = 96
h = 96
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